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Cher performs at the Billboard Music Awards at the T-Mobile Arena on Sunday, May 21, 2017, in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Gallery: Onstage at the 2017 Billboard Music Awards

From Cher’s barely-there costumes to Miley Cyrus’s makeunder, here are the moments that dominated the 2017 Billboard Music Awards’ stage at the T-Mobile Arena in Las Vegas.